The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 22, 2022
Filed:
Jan. 13, 2020
Applicants:
Patrick Butler, Alexandria, VA (US);
Paul Knittle, Alexandria, VA (US);
Inventors:
Patrick Butler, Alexandria, VA (US);
Paul Knittle, Alexandria, VA (US);
Assignee:
MPR Associates, Inc., Alexandria, VA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16K 3/18 (2006.01); F16K 31/50 (2006.01); G21D 3/04 (2006.01);
U.S. Cl.
CPC ...
F16K 3/186 (2013.01); F16K 31/50 (2013.01); F16K 31/508 (2013.01); G21D 3/04 (2013.01);
Abstract
An anti-rotation device for preventing separation of a valve stem and valve disc(s) in a gate valve in a nuclear reactor power plant of the type where connection means, such as a wedge or disc hub, is threadedly engaged by the valve stem to actuate the valve and a method for maintenance or repair of the valve without disassembly of the valve or removal of the valve actuator.